Đề tài nghiên cứu nhằm giảm thiểu tối đa protein dư thừa được chuyển hóa và hấp thu ở ruột non và giảm thiểu các protein không tiêu hóa hết di chuyển đến ruột già của lợn. Từ đó giảm thiểu các hợp chất gây mùi ảnh hưởng đến môi trường và sức khỏe con người và vật nuôi. | The main objective of this study was to determine the effects of dietary crude protein (CP) level on sulfurous, indolic, phenolic compounds and volatile fatty acids (VFA) concentration of pig manure. An experiment was conducted with growing pigs (n = 18) in a randomised complete-block design with three treatments in six blocks. Treatment groups were 12%, 15% and 18% CP diets. Faeces and urine of each pig were accumulated together in a separate manure pit under the slatted floor. In the 5th week of the collection period, manure samples were collected directly from each manure pit. Manure samples were analysed for VFA, and indolic, phenolic and sulphurous compounds, ammonium and total nitrogen concentrations. Reducing dietary CP from 18% to 12% decreased methyl sulphide, carbon disulphide, ethanethiol, phenol, 4-ethyl phenol, indole, 3-methyl indole and total nitrogen concentrations in the manure (P < 0,05). A reduction of dietary CP is an option to reduce odorous compounds from pig manure thus to reduce negative impacts of pig production on environment and human and animal health.
